I recently saw a pitch from a startup that have a gadget [1] designed to address exactly the problems you talk about and might be worth a look (disclaimer: I have no relationship with the company but I do cycle a lot and thought their product looked promising). The debate amongst the investors afterwards was interesting, once the startup had left the room. The investors who didn't cycle/motorbike were sceptical and couldn't understand why a mobile phone wasn't good enough for this whereas the investors who had some cycling experience were mostly positive about the product.